Hi, I currently use modded Fostex T50RP and UE TF 10. Source is Clip + for 70% of time and remaining I play off my laptop. Clip drives both of them fine but volume on Fostex is low when plugged into laptops. Would an amp/dap make a noticeable difference in this setup ? If so is E17 is a good option for neutral sound I prefer as there is some nice deal going on currently, may be stock clearance. Thanks

You need to be a little careful, some amps are excellent and can really add when using a decent source and decent headphones but some cheaper ones can actually be detrimental to the sound. The likes of Beyerdynamic A20, Lehmann Rhinelander are stunning.

The FiiO stuff is what I use. (I myself have a MrSpeakers Mad Dog, which is a modded Fostex T50RP variant.) It's good for the money and -- if you get the E07K or E17 -- provides nifty tone controls on top of the added volume. I wouldn't spend too much, though, as the Fostex 'phones just aren't that comparatively hard to drive.

Like most products you tend to get increasing sound quality and durability with increasing cost, but there will be a point where the law of diminishing returns kicks in, as I found when selecting amp/ dac's recently. I decided to buy the best I could justify to my wife lol, but I'm really happy with my Chord Hugo which is a combined dac and amp with rechargable battery. Looks pretty cool too....